Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ffaad142759a17…

MALICIOUS

PDF

85.8 KB Created: 2021-09-13 18:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a915040b263507cda79d5e7f9ba05916 SHA-1: 06613878a8845460721aa9236c82879b93177253 SHA-256: 75ffaad142759a17990673799e3d216c6fb2bda723d37b22416ba01f163df0cb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by a ML classifier and ClamAV, and exhibits characteristics of a callback phishing lure. The document body is heavily obfuscated, but the presence of multiple PDF link farm heuristics and embedded URLs suggests an attempt to redirect the user to malicious content or services. No scripts were extracted from this sample, limiting the ability to determine specific execution chains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://sdds.be/userfiles/file/wijitiruner.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316049c9f2c---vudijefawedumineselitewiz.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/63387107211.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/81498405948.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/piguwolamopaj.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/68612074868.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/30769096985.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/ronutojekufopediz.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/80653128144.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/rixawijobim.pdfIn PDF document text
    • http://104408017.linker.tw/files/79217241593.pdfIn PDF document text
    • http://195exim.com/datas/files/36575463474.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/nulatasuzamenigodix.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/jivuj.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/77068629279.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/95912623997.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/1d0cd30c472b199f80c1bc2a0476ce4e/37291313910.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210901_47ECA89F59611F5B.pdfIn PDF document text
    • https://europartner2.pl/uploads/waradosuzuvitula.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138131938215---wejuguf.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/46313099757.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/fakebolasobi.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/37653526675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=deleting+miscellaneous+files+on+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AC 17812 bytes
SHA-256: 5ea379859a9dd3a1ee5e652f7e13bc6372b9ad8de5ee65564d13ba2cacef14a2
font_02_sfnt_off0001302b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302B 10920 bytes
SHA-256: b1854e6b2edb67121a8b87810057cd699b4d71cdfcc42534ae5aa61ad933174b

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